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The conversion of nitrous oxide in a positive pulsed corona discharge (PPCD) was studied using two stainless-steel corona reactors with the inner high-voltage electrode made of metal wire (0.3 mm in diameter). The length of the active zone was 0.75 m (reactor R1) or 0.45 m (reactor R2). In the experiments with 5% of oxygen (reactor R1), the overall conversion of N2O (to oxygen, nitrogen, and NOx) considerably decreased, which was about 50% smaller than that in argon alone under the same conditions. The presence of a small amount of oxygen in the gas, containing N2O, allowed us to carry out the process using a considerably lower initial concentration of nitrous oxide. For the initial N2O concentration below 1%, it was observed that the corona discharge is not stable and changes into a spark discharge. When the N2O conversion was carried out in argon and oxygen (5% by volume), the conversion of N2O to NOx was 11.7% for the initial N2O concentration of 2%. The influence of oxygen in Ar + N2O (10%) on the overall conversion and conversion of N2O to NOx was also investigated. The increase of oxygen concentration from 5% to 45% resulted in a decrease of the overall N2 O conversion and its conversion to NOx . PPCD could have been unstable and changed into a spark discharge when the N2O concentration was low.